Excellent View of Low-Level Jet……..Few Showers/T’Storms……Stronger Winds Approaching (Will Improve Visibilities Greatly)January 29th, 2013 at 12:25 am by Chad Evans under Chad's WLFI Weather Blog
Below is an excellent view of the strong low-level jet helping with forcing for storms in Illinois along & north of the warm front. Notice the ripples with the drizzle/shower echoes in Illinois, clearly showing the wind-induced waves.
It is a ribbon of strong winds that becomes strongest at night that transport moist, unstable air & lift northward. As Earth’s spins, the jet curves to the right (called Coriolis Effect).
A few passing showers & t’storms are possible tonight & tomorrow (30%………some of you will stay dry), but the bulk of it will be northwest & west of here.
Much stronger winds are approaching, which will increase visibilities greatly overnight-early Tuesday morning from 0-0.50 mile to 1-4 miles.
1-3″ still looks good for total rainfall with most of it falling Tuesday overnight. 1-2″ will largely fall, but there will be some isolated 2-3″ amounts, so kept it as 1-3″. Sporadic damaging straight-line wind threat will exist overnight Tuesday & early, early Wednesday morning in our western half. This forecast remains unchanged.
If higher dew points can move in, then isolated EF0-EF1 tornado threat will need to be introduced, but I am not ready to do that right now.
With the record warmth with highs of 61-66, winds may gust to 40 mph tomorrow & tomorrow night.